My truck has six Firestone Steeltex Radial R4S tires on it. The size is LT 265/75R16 123/1200, the load range is "E" and on the sidewall of the tire it says, "Max load 1550 kg (3415 lbs) at 550 KPa (80 psi) cold."

The other day, I checked the pressures (for the first time) and I noticed there wasn't 80 lbs of air in the fronts, so I added up to that point. I could not check the rears because I didn't have the proper guage, or air nozzle or that matter. Afterwards, the ride wasn't nearly as good and the steering was a little more erratic than it was. So, today, I stopped by my tire store, and had them check my pressures. The guy there said that if I wasn't hauling a heavy load, then 80 lbs was too much. He recommended 60 lbs in all six tires since I don't haul a heavy load. We also noticed that the rears had 80 lbs in the outsides and 60 lbs in the insides. Does anyone else run their dually tires this way? What pressure(s) does everyone else usually run?

Thanks in advance!

 

I run 45 all around unless I was to put over 1000 lbs in the rear.
I don't have dually's but I would think they should be equal and about 45 should be fine...maybe someone with them could give you more info...

Also I don't do more than 25 miles on the highway usually..

Dick

 

I run 50 front///70 rear

d/ft

 

the rear could use less much less unless you use yer truck...no weight back there.

 

I use 55 lbs. pressure all the way around. I have the SRW.

 

On my old 16"e's I ran 60 front and 55 rear unloaded. These trucks have double the empty weight on the front axle(when unloaded), thus more air in the fronts.

Running empty and pumping up to 80lbs will not only shake your teeth out, it will cause your tires to wear more in the centers (unloaded).

Air 'em up to 80 when you're hauling the BIG load

My old dually only got flats on the inside tire. It sems that the inside carries the brunt of the load. I'm sure airing up the OUTSIDE tire higher than the inside one is an effort to get the outside tire to equally share more of the load(?)

 

I have 285/75 BF Goodrich ATs and I've been keeping 60 front and 65 rear recently. It's probably higher than it needs to be but I've been experimenting to see how much keeping them at the higher psi helps the mpg.

 

I run 45 in the fronts and 50 in the rear unloaded. More air in the rear when I tow the boat or haul 'stuff' for the wife to work the yard.

I have Michelin LTX M/S 285/75/16 all the way around.

 

50 psi all the way around unless I pull a load that puts over 2000 lbs on the back, then I just air up the back to 60 psi. No problems - have done this on all my DRW's since radials came out...back when.

 

redtaurus94...

heres the answer to you and everyoone elses question.

most trucks have a sticker in the door jam or gas cap door for recommended pressures. mine says 55psi front and 70psi rear for max load.

I run 55psi up front and 40psi in the rear.

tire pressure is directly related to the weight or load on the tire, low wieght gets low pressure, more weight gets more pressure.

set you fronts to the recommended 55psi. place a piece of 2x4 in front of the tire and one in the rear of the tire, then measure the distance with a ruler. this gives you the front-back footprint. next do the same to the rear with nothing in the bed, while measuring air down the tire until the distance is the same as the front, or put the normal carrying weight in the bed and do the same. basicall this allows one to set the tire pressures to achieve equal front and rear tire foot prints, I came up with 55psi in the front as recommend by the factory and 35psi in the rear gave Me the same foot print as the fronts, but I figure I would put 40psi in the rear in case I put a few things back there. This assures the tires wear evenly and the ride comfort is nice. on a dually the inside/outside tires might be the same or different, not sure, but do the footprint test to see, your tires will last alot longer....

 

Here is the tire inflation table for the Steeltex LT265/75R16 that I down loaded from this site back in 2001

Weight/Pressure
1910/35
2100/40
2280/45
2470/50
2625/55
2790/60
3000/65
3105/70
3260/75
3415/80

Go to a Weigh Scale after hours when they are closed and weigh your front axle and divide the weight by 2. Do the same for the rear axle then inflate your tires as per the chart. Supposedly this chart came from www.trucktires.com The post also said that at speed from 65-74 mph add 10 psi, 75-84 add 10 psi and decrease load by 10%.

Hope this is useful

 

THANKS!!

I appreciate all the good info.........